From de879c15ee2bcef6f59c1796cf221c3a5daa1347 Mon Sep 17 00:00:00 2001
From: YuQing <384681@qq.com>
Date: Wed, 30 Jun 2021 15:05:31 +0800
Subject: [PATCH] uniq_skiplist.h: add function uniq_skiplist_iterator_at

---
 HISTORY             |  3 ++-
 src/uniq_skiplist.h | 14 ++++++++++++++
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/HISTORY b/HISTORY
index f6d8239..6c89b46 100644
--- a/HISTORY
+++ b/HISTORY
@@ -1,6 +1,7 @@
 
-Version 1.53  2021-06-26
+Version 1.53  2021-06-30
   * process_action support action status
+  * uniq_skiplist.h: add function uniq_skiplist_iterator_at
 
 Version 1.52  2021-06-08
   * process_stop more gracefully (kill -9 on timeout)
diff --git a/src/uniq_skiplist.h b/src/uniq_skiplist.h
index c388598..d14ecc0 100644
--- a/src/uniq_skiplist.h
+++ b/src/uniq_skiplist.h
@@ -192,6 +192,20 @@ static inline void *uniq_skiplist_next(UniqSkiplistIterator *iterator)
     return data;
 }
 
+static inline void uniq_skiplist_iterator_at(UniqSkiplist *sl,
+        const int offset, UniqSkiplistIterator *iterator)
+{
+    int i;
+
+    iterator->current = sl->top->links[0];
+    iterator->tail = sl->factory->tail;
+
+    i = 0;
+    while (i++ < offset && iterator->current != iterator->tail) {
+        iterator->current = iterator->current->links[0];
+    }
+}
+
 static inline int uniq_skiplist_iterator_count(UniqSkiplistIterator *iterator)
 {
     volatile UniqSkiplistNode *current;